Ive had some Sports Grey paint mixed and its a perfect match. This might be 4 years late for the original poster but may help others as it wasnt easy to get a perfect match on my car. The Glasurit Numbers posted elsewhere on here were no use to my paint supplier.

It seems to be an Audi exclusive colour and as our German friends on here will know ZeltGrau translates to Tent Grey or Tarpaulin Grey!

RAL Zeltgrau S121.0.333

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Rob